Knife-grinder



(No Model.) 2 Sheets-Sheet 1.

S. 0. ROGERS. KNIFE GRINDER. No. 507,634. Patented Oct. 31,1893.

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(No Model.)

S. 0. ROGERS. KNIFE GRINDER.

Patented Oct. 31. 1893.

1N VEN TOR WITNESSES: a WMAL; QFWM.

ATTORNEY NITED STATES PAT NT OFFICE.

SAMUEL C. ROGERS, OF BUFFALO, NEW YORK.

KNIFE-GRINDER.

SPECIFICATION forming part Of Letters Patent NO. 507,634, dated October31, 1893.

Application filed August 31, 1892. Serial No. 444,697- (N 0 model.)

To all whom it may concern.-

Be it known that L'SAMUEL 0. ROGERS, a subject of the Queen of GreatBritain, residing at Buffalo, in the county of Erie and State ofNewYork, have invented certain new and useful ImprovementsinKnife-Grinders; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to figuresof reference marked thereon, which form a part of this specification.

My invention relates to improvements in knife-grindersand moreparticularly to that class of knife-grinders in which a knife blade maybe ground with a concaved beveled edge. Its object is to provide aknife-grinder as above referred to in which the concaved or grooved edgegiven to the blade may be varied. This is effected by the adjustment ofthe bed-plate in which the knife is held.

It consists in the novel and peculiar arrangement of parts and detailsof construction all of which will be hereinafter first fully describedand then pointed out in the claim.

In the drawings already referred to which serve to illustrate my saidinvention more fully, Figurel is a top plan View of my improved grinder.Fig 2 is a side elevation of the same, and Figs. 3, and t are views ofthe standard of my improved knife-grinder, taken in section so as toshow interior construction.

Referring to the drawings, 1 is the grinding-wheel (preferably made ofemery), which is rigidly mounted upon the shaft 2. Gentrally mountedupon the shaft 2, and between the arms of the bracket 3, are the rigidand loose pulleys 4 and 5, respectively, and at the outer end of theshaft 2, is rigidly mounted the broad pulley or drum 6.

7 is the standard or casing of the grinder and has mounted near itslower end the shaft 8, which projects through the casing and rests inthe sleeve 9. This shaft 8, has mounted at its outer end the two loosepulleys 10 and 11, and tight pulley 12, and has secured to its inner endthe pinion 13, which engages with the gear 14:, mounted on thecentral-vertical shaft 15. (See Figs. 3 and t.) At the upper end of thisshaft 15 is rigidly mounted 20, in which the vertical shaft 15, ismounted,

the annular plate 21, which rests in the top of the standard 7, and theprojecting frame or track 22, upon which the reciprocating frame 18travels.

When it is desired to grind a knife blade with my improved grinder, theblade 23 (see Fig. 2), is bolted to the reciprocating frame 18, by thebolts 24, with its edge facing the wheel 1. The entire bed-plate is thenrevolved within the standard so as to present that portion of the bladeto be ground to the periphery of the wheel 1, (asseen in Fig. 1.) Bythis means a concaved beveled edge is given to the edge of the blade theradius of which concaved surface may be varied by changing the angle atwhich the blade is hold while being ground. The position of the blade isadjusted to and from the wheel 1, by the hand wheels 25, which arethreaded into the slides 26, arranged upon the reciprocating frame 18,and upon which theknife carrying frame is pivoted. The incline given tothe blade 23, is regulated by the spring-pressed adjustment 27,consisting of the projecting arm 28, hand wheel 29, andspiral spring 30.(By this arrangement I am enabled to vary the breadth of the bevel givento the edge of the blade.)

31 and 32, are two bell-crank levers pivoted to the depending bracket20, the upper bell crank lever 31, having one of its arms projectingthrough the standard and resting between the bed plate and reciprocatingframe (see Fig. 4) and its other arm connected to one of the arms of thebell crank lever 32, by the spiral spring 33, which is stiffened by arod 34, passing through it, the remaining arm of the bell crank lever32, being pivoted to the reciprocating lever 35, which alternatelythrows the belts 36 and 37, upon the tight pulley 12, as power isapplied to the pulley 4, and transmitted through my improved grinder asjust described, the pulley 10, operating the shaft 8, which in turn isconnected to the vertical shaft 15, and pinion 16, which engages withthe rack bar 17, causing it to travel in one direction. The rack bar andits reciprocating frame will continue to travel in this direction untilturned by one of its adjustable bolts 38. (These bolts 38, are adjustably secured in place by the thumb nuts 39,and rest in elongatedopenings 40, arranged in the frame 18.) As one of the bolt-heads 38,comes in contact with the projecting arm of the bell crank lever 31, itturns the bell crank lever 31, sufficiently to turn the bell crank lever32, to

which it is connected and cause it to operate the reciprocating lever35, and (assuming that the cross belt 37, has just been operating), thebelt 37, is drawn upon the loose pulley 11, and the belt 36, is drawnfrom the loose pulley 10, upon the rigid pulley 12, thus causing theshaft 8, and its connections to revolve in the opposite direction. Therebeing. a bolt 38, arranged at each endof the reciprocating frame. 18,the bell. crank lever 31, is alternately turned from=onedirection to theother thus making the operation of myimproved grinder entirely automaticafter the blade has beenplaced in position.

It will be seen that by placing the reciprocating frame 18, containingthe blade 23, in the position shown in Fig. 2, a fiat or plainbevel maybe obtained, and as it is turned upon its annular plate 21, the bevelbecomes concavedthe radius of whichis varied according to the angleatwhich the frame 18, is placed. It will also be seen that the angle atwhich the blade is held in the frame can be varied by adjusting thespring pressed adjustment 27, thus regulating the breadth of the bevel.The spiral spring 33, connecting the bell crank levers 31 and 32 mightbe dispensed with and substituted by a rod con-.

nected by universal joints but the arrangement shown is preferred.

Having thus described my invention, what I claim, and desire. to securebyLetters Patent, is-- The herein described knife-grinder consistingessentially of the wheel 1, mounted upon the shaft 2, said shaft beingconnected to and

